gpu: Add cold-plug test

Cold plug setting is now correctly decoded in toml

Signed-off-by: Zvonko Kaiser <zkaiser@nvidia.com>

src/runtime/pkg/hypervisors/hypervisor_state.go

@@ -5,6 +5,8 @@
 
 package hypervisors
 
+import "fmt"
+
 // Bridge is a bridge where devices can be hot plugged
 type Bridge struct {
 	// DeviceAddr contains information about devices plugged and its address in the bridge
@@ -40,6 +42,18 @@ const (
 	NoPort = "no-port"
 )
 
+func (p PCIePort) String() string {
+	switch p {
+	case RootPort:
+		return "root-port"
+	case SwitchPort:
+		return "switch-port"
+	case NoPort:
+		return "no-port"
+	}
+	return fmt.Sprintf("unknown PCIePort: %s", string(p))
+}
+
 type HypervisorState struct {
 	BlockIndexMap map[int]struct{}
 

src/runtime/pkg/katatestutils/utils.go

@@ -319,7 +319,7 @@ func MakeRuntimeConfigFileData(config RuntimeConfigOptions) string {
 	enable_iothreads =  ` + strconv.FormatBool(config.EnableIOThreads) + `
 	hotplug_vfio_on_root_bus =  ` + strconv.FormatBool(config.HotplugVFIOOnRootBus) + `
 	pcie_root_port = ` + strconv.FormatUint(uint64(config.PCIeRootPort), 10) + `
-	cold_plug_vfio =  "` + config.ColdPlugVFIO + `"
+	cold_plug_vfio =  "` + config.ColdPlugVFIO.String() + `"
 	msize_9p = ` + strconv.FormatUint(uint64(config.DefaultMsize9p), 10) + `
 	enable_debug = ` + strconv.FormatBool(config.HypervisorDebug) + `
 	guest_hook_path = "` + config.DefaultGuestHookPath + `"